COMPARISON OF SOMATOSENSORY-EVOKED FIELDS TO AIRPUFF AND ELECTRIC STIMULI
COMPARISON OF SOMATOSENSORY-EVOKED FIELDS TO AIRPUFF AND ELECTRIC STIMULI
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DOI：
10.1016/0168-5597(94)90135-x
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发表时间：
1994-11-01
期刊：
影响因子：
--
通讯作者：
HARI, R
中科院分区：
文献类型：
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作者：
FORSS, N;SALMELIN, R;HARI, R
我们用122通道全头皮SQUID梯度仪记录了6名健康受试者的体感诱发磁场（SEFs）。在单独的实验中，对中指近端指骨背侧进行气泡刺激，对手腕正中神经进行电刺激；刺激间隔为3秒，在随后的实验中分别刺激左手和右手。呼气在所有受试者中都引起了清晰且可重复的反应。第一反应被记录在大脑皮层上。所有受试者对对侧和同侧充气均表现出SII反应。后顶叶源，以前被电刺激识别，也被气吹激活，但只在右半球。与电刺激相比，SI对ah-puffs的最早反应幅度更小，潜伏期更长；其他体感区产生的长潜伏期反应没有显著差异。
We recorded somatosensory evoked magnetic fields (SEFs) from 6 healthy subjects with a 122-channel whole-scalp SQUID gradiometer. In separate experiments, airpuff stimuli were delivered to the dorsum of the proximal phalanx of the middle finger, and electric stimuli were delivered to the median nerve at the wrist; the interstimulus interval was 3 sec and left and right hands were stimulated in subsequent sessions. Airpuffs evoked clear and reproducible responses in all subjects. First responses were recorded over the SI cortex. All subjects showed SII responses both to contra- and ipsilateral airpuffs. The posterior parietal source, identified previously to electric stimulation, was activated also by airpuffs, but only in the right hemisphere. The earliest responses from SI were smaller in amplitude and longer in latency to ah-puffs than to electric stimuli; the long-latency responses arising from the other somatosensory areas did not differ significantly.